Roller for twister machines



p 17,1946 I c. HJWETHERSV 2,407,730

ROLLER FOR TWISTER MACHINE Filed June 15, 1945 Patented Sept. 17, 1946 1 UNITED STAT ROLLER FOB 'rwis'rm MACHINES I Cliflord H. Wethers, Detroit,Mich., Application June 15, 1945; Serial No. 599,583

4 Claims. (01. av -9 0} This invention relates to twister rolls such as are incorporated in the spinning heads of cotton and yarn spinning machines and has for its object to provide in a simple and practical manner for the prevention of theyarn or material being twisted from becoming displacedfor any material length of time from the surface of its individual top twist roll and to provide simple means for returning the yarn to the roll surface should it momentarily slip over the end of the roll.

In such machines a number of short upper twist rolls are usually positioned in co-axial arrangement separated by suitable bearings above a lower twist roll, generally of larger diameter, the yarn passing from the creel by way of a water trough over and under these upper twist rolls, then between the upper twist rolls and the lower twist roll and partially around the lower twist roll to guides and thence through the fiyers to the bobbins on which the twist yarn is wound. The action of the machine is such that the thread or yarn passing around the said top twist roll wanders in the direction of the length of the roll, toward and from the ends thereof, and it frequently happens that the yarn will travel too far and thus slip over the end of the roll and run onthe smaller hub or bearing, thus upsetting the relationship of the yarn feed to the lower twister roll and resulting in ahard twist being imparted to the yarn where the mechanical setup was arranged to impart a soft twist thereto. This is highly undesirable and its prevention is very important.

The present invention, therefore, proposes to provide a form of upper twist roll which will automatically return the yarn to the periphery of the said roll with a minimum lapse of time whenever the yarn should wander beyond the ends of the roll and. tend to fall onto the hub or bearing thereof; and, more particularly, the said invention has for its object to provide in such a roll pick-up fingers or projections at the ends thereof which will immediately intercept any thread or yarn attempting to drop over the end of the said roll and will as a result immediately lift the thread to the level of the roll surface whereupon it can'again travel over such surface and between the upper and lower twister roll in the manner intended.

Still further objects or advantages additional or subsidiary to the aforesaid objects, or resulting from the construction or operation of the invention as it may be carried into efiect, will become r 2 apparent as the said invention is hereinafter'further disclosed. r In carrying the said inventioninto effect, I may provide each individual upper twister roll of a spinner head with projections extending therefrom and on their outer surfaces form a continuation of the normal peripheral surfac e of the roll, said projections providing abutment surfaces on to which yarn may descend should it pass over one or other end of the roll,where by such abutment surfaces will maintain the yarn in temporary alignment with the outer surfaces of the said projection for a sufiicient length of time to permit one or other of the projections, as it rotates with the roll, to lift the yarn back to the level of the roll surface and thereby permit it to travel back onto the roll as required. All of which ismore particularly described and ascertained, by way of example, having'reference to the accompanying drawing, wherein:

Figure 1 is a perspective view of an improved upper twister roll embodying the said invention; Figure 2 is a similar view of a somewhat modified form of the same; i

Figure 3 is a front elevation showing upper and lower twister rolls in relative positions; and

Figure 4 is an end elevation partly in section ofthesame. a l i Similar characters of reference indicate similar parts in the several figures of the drawing.

The twisting mechanism of a spinning machine includes a lower twister roll l0 surmountedbya series of upper twister rolls l I which; usually rest upon and are frictionally driven by the saidlower roll I0, except that yarn l2 fromthe 'creels (not shown) passing over and under each roll I l and between the said roll H and the roll it naturally effect a spacing of the rolls II and It to the extent of the thickness of the yarn. This yarn also passing partially around the roll II], which is rotated by means well known in the art at a suitably determined speed, passes thence through guides l3 to the flyers and bobbins (not shown) thereby completing the spinning and winding of the thread, technical details of which operation need not be dwelt upon herein asthey are quite old and well known in the art to which this invention appertains.

The several rolls II are spaced apart in coaxial relation by bearing members l4, and, in the course of the yarn-twisting operation, it often happens that a length of yarn passing over the roll ll and constantly changing location as to the length of the roll, by reason of the variable manner in which the yarn approaches or leaves the said roll, passes beyond the extremities of the roll and-thus proceeds to travel around the hub I 5 or the bearing member [4. This upsets roll is not noticed and immediately corrected and the incorrectly twisted yarn thus permitted to wind to any extent on the bobbin, thread of an I uneven and inferior quality is the result.

By my invention I automatically correct such displacement of the yarn by providing on the; ends of the roll ll projections I6 which I prefer.

to make of arcuate form, as shown in Figure 1, with theirouter surfaces [1 being a continuation of the surface of the roll, the ends of the said projection I 6 being in the form of abutments "l8 extendin more or less along chords of the ends of the roll. Thus the said abutments N3 of each projection l6 are in materially spaced relation on opposite sides of a radial planepassing trough the abutment and the center'of'the twister-roll.

Theserolls revolve 'quite rapidly and it will be readily apparent from an examination of Figure '4 that if yarn should slip over an end of the roll it, as indicated in dotted lines of the said Figure 4, it will be caught and held by one of the abutine'nt surfaces 18 of one of the projections [6 in such manner that, as the roll continues to rotate theabutment surface I8 of the other projection the said projections I G as the roll continues to rotate, so that in any case the amount of time I elapsing before the yarn is eventually returned i to its correct running position will be very small. f

The exact form of the yarn-lifting projections 1.8 of the projections I6 previously described. The

ends of the said diametral ribs 20 will thus naturally be av continuation of the peripheral surface on that end of the roll "will engage beneath the I upper "extended length of yarn whereby the continued movement 'of this projection I 6 will lift the yarn back to the position shown in full lines at the'top of the sai'ol' Figure 4.

The outer surface of the said projection I6 is a continuation of the general peripheral surface of the roll so that itthereby encouragesthe yarn .to resume its correct position running over the surface 'offlthe roll. The winding motion of the yarn'on the roll is such that'its tendency to feed beyond the limits of the roll length is more or lessmomentary whereby this quick lifting of the-yarn back to the periphery of the roll will usually sufiice to immediately return'it to the .roll'. r

- =In relatively rare cases, where the yarn does not immediately return to its correct running position, it will again and again in rapid successionbe subjected to the same lifting action by .of the. roll.

This invention maybe develop-ed within the scope of the following claims without departing 1. In a twister roll of'the type described, projections extendin endwise beyond the "normal length of theroll, part of the surface of such. projections being a continuity of the peripheral surface of the rolL'and the spacing between said projections being uninterrupted by the .roll proper.

2. In a twister roll of the type described, pro-.

jections extending endwise' beyond the normal length of said roll, said projections having lateral abutment surfaces arcuately extending materially on either side of a radial plane passing through the center of the projection andthe center of the roll, and the spacing between said projections being uninterrupted by the roll proper.

3. Ina twister roll of the type described, projections eXtendlng endwise beyond the normal length of the roll, the outer part of the surface of such projections being arcuate and a continuity of the peripheral surface of the roll, and the spacing between said projections being uninter- 'rupted by the roll proper.

4. In a twister roll of thetype described, projections extending endwise beyond the normal length of said roll, said projections having lateral abutment surfaces materially and uninterruptedly spaced on either side of a radial plane passing through the'center of the projection and the center of the roll, the outer part of the surface of such projections being arcuate and a continuity of the peripheral surface ofthe roll.

CLIFFORD H. WETHER'VS. 

